Zairyo-to-Kankyo
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480

Zairyo-to-Kankyo Vol. 58 (2009), No. 6

  • The Role of JSCE

    pp. 213-213

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.58.213

  • High Temperature Sulfidation-corrosion and Countermeasures on Power Recovery Turbine for Oil Refinery Equipment

    pp. 214-220

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.58.214

    A Ni-base alloy, UNS N07001, is generally used for power recovery turbine rotors for fluid catalytic cracking units of oil refinery equipment (FCC gas expander turbines). However, the alloy may suffer from sulfidation-corrosion caused by H2S and SO2 contained in the FCC exhaust gas. This paper describes the problem of high-temperature sulfidation-corrosion of FCC gas expander turbine rotors and the influence of the gas composition, temperature, and stress to the grain boundary sulfidation-corrosion behavior. In addition to explanation of the fracture mechanism of the gas expander turbine blades, countermeasures against high-temperature sulfidation-corrosion are introduced: Cr diffusion coating, a steam cooling system, and a sulfidation-corrosion resistant Ni-base alloy. The Cr diffusion coating is highly dimensionally accurate allowing use on close tolerance fitting parts with complicated profiles such as blades and disks and shows high sulfidation-corrosion resistance in the operating conditions of gas expanders. The developed sulfidation-corrosion resistant Ni-base alloy for FCC gas expander turbine rotors offers high-temperature strength equivalent to the conventional alloy, UNS N07001, with higher sulfidation-corrosion resistance.
  • SCC Behavior at Hardened Surface Layer of 316(LC) in Water on High Temperature

    pp. 228-233

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.58.228

    SCC behavior on hardened surface layer of 316(LC) in high temperature water was studied. The hardened surface layer was prepared by laboratory experiments. A depth profile of residual stress at the hardened surface layer was estimated using SPring-8. The results showed the residual tensile stress was more than 900 MPa at the top of surface layer where HV was about 300. SCC susceptibility was estimated by a creviced bent beam test in water containing 200 ppb SO42– and 8 ppm dissolved oxygen at 561 K. It became clear that the threshold stress of SCC for 316(LC) existed and the value was about 600 MPa in this condition. The residual tensile stress caused by surface finishing is considered to play an important role in SCC.
  • Relationship between Cathodic Current and Microorganism on Stainless Steel in Seawater

    pp. 234-240

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.58.234

    Cathodic currents measurements and biological analysis were conducted for type 329J4L stainless steel exposed to natural seawater for the purpose of finding a factor in microbiological promotion of crevice corrosion propagation. The cathodic current density measured at 0.2 V vs. SHE rose from values below 0.1 μA/cm2 and became higher than 2 μA/cm2 in summer. However, there was no obvious rise in cathodic current densities and their values were lower than 0.1 μA/cm2 at the other seasons. 16S rRNA gene analysis revealed that bacteria belonging to Genus Algibacter or Class Gammaproteobacteria were specific to biofilms on the sample with the rise in the cathodic current density above 2 μA/cm2 in summer. The population of all kinds of bacteria did not have positive effect on cathodic currents. It is, therefore, concluded that large cathodic currents resulting in high corrosion rate are mainly induced by the action of specific bacteria, and that there is a possibility of Algibacter or Gammaproteobacteria having action to enlarge cathodic currents.

Article Access Ranking

11 Apr. (Last 30 Days)

  1. Three-dimensional Investigations of Non-metallic Inclusions in Stainless Steels before and after Machining ISIJ International Advance Publication
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Influence of Ore Assimilation and Pore Formation during Sintering on Reduction Behavior of Sintered Ores Tetsu-to-Hagané Vol.107(2021), No.3
  4. Development Technology for Prevention of Macro-segregation in Casting of Steel Ingot by Insert Casting in Vacuum Atmosphere ISIJ International Advance Publication
  5. Numerical Simulation of Flow, Heat, Solidification, Solute Transfer and Electromagnetic Field for Vertical Mold and Curved Mold of Billet ISIJ International Vol.61(2021), No.3
  6. Deformation Behavior of Longitudinal Surface Flaws in Flat Rolling of Steel Wire ISIJ International Advance Publication
  7. Dissolution Behavior of Mg and Ca from Dolomite Refractory into Al-killed Molten Steel ISIJ International Advance Publication
  8. Structural and Mechanical Characterizations of Top Dross in a Molten Zinc Bath ISIJ International Vol.61(2021), No.3
  9. Numerical Study into Gravity Separation of Phosphorus from BOS Slag during Solidification ISIJ International Vol.61(2021), No.3
  10. Crystal Structure Analysis of Top Dross in Molten Zinc Bath by First Principles Calculation and Synchrotron X-ray Diffraction ISIJ International Vol.61(2021), No.3

Search Phrase Ranking

11 Apr. (Last 30 Days)

  1. blast furnace
  2. coke oven gas injection
  3. blast furnace permeability
  4. slag
  5. tetsu-to-hagané
  6. blast furnace productivity
  7. effects of coiling temperature on microstructure and precipitation behavior in
  8. fundamental study on rapid reduction of chromium ore in basic oxygen furnace
  9. iron phosphide (fe2p, fe3p)
  10. iron phosphide (fe2p, fe3p), formation energy